Type I Superconductivity in YbSb2 Single Crystals

Abstract

We present evidence of type I superconductivity in YbSb2 single crystals, from DC and AC magnetization, heat capacity and resistivity measurements. The critical temperature and critical field are determined to be $T_c\approx$ 1.3 K and $H_c\approx$ 55 Oe. A small Ginzburg-Landau parameter κ= 0.05, together with typical magnetization isotherms of type I superconductors, small critical field values, a strong Differential Paramagnetic Effect (DPE) signal, and a field-induced change from second to first order phase transition, confirm the type I nature of the superconductivity in YbSb2. A possible second superconducting state is observed in the radiofrequency (RF) susceptibility measurements, with $T_c^{(2)}\approx$ 0.41 K and $H_c^{(2)}\approx$ 430 Oe.

6 pages, 10 figures

References in corpus (4)

• Magnetic Penetration Depth in Unconventional Superconductors
• Specific heat and $\mu$SR study on the noncentrosymmetric superconductor LaRhSi3
• Type-I superconductivity in ScGa3 and LuGa3 single crystals
• Exceptional type-I superconductivity of the layered silver oxide Ag${}_5$Pb${}_2$O${}_6$

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